Frequently Asked Questions About Peterbilt 567/579 Frame Light Bars & Filler Panels

What are the material differences between chrome, stainless steel, and painted light bars?

Chrome-plated light bars offer a mirror-like finish but require regular polishing to prevent pitting and corrosion, especially in areas with road salt. Stainless steel options (typically 304-grade) provide excellent corrosion resistance and maintain their appearance with minimal maintenance, though they have a slightly less reflective finish than chrome. Painted light bars come with a durable powder coat finish that resists chips and fading, ideal for color-matching your truck or achieving a blacked-out look. For longevity in harsh conditions, stainless steel is the most durable choice.

Will these light bars fit my specific Peterbilt 567 or 579 model year?

Frame light bars and filler panels for Peterbilt 567 and 579 models are generally compatible across model years 2013-present, as the frame rail spacing and mounting points have remained consistent. However, you should verify your specific bumper configuration - set-forward, set-back, or flush-mount bumpers may require different light bar lengths. Measure your existing setup or provide your VIN when ordering to ensure proper fitment. Note that pre-2013 models may have different mounting hole patterns.

What tools and hardware are needed for installation?

Installation typically requires basic hand tools including a socket set (usually 9/16" and 5/8"), drill with metal bits for any custom mounting, and wire strippers for electrical connections. Most light bars come with mounting brackets and hardware, but you may need additional bolts depending on your setup. For wiring, you'll need to tap into your existing marker light circuit or add a separate switch. Professional installation usually takes 2-3 hours, while DIY installation may take 4-6 hours depending on electrical experience.

How many lights can I add, and what are the regulations?

DOT regulations allow additional lights as long as they're amber or white facing forward, and red facing rearward. Most frame light bars accommodate 3-7 lights per side, depending on length. Common configurations include 3-light bars (typically 26-30 inches), 5-light bars (40-45 inches), and 7-light bars (52-58 inches). Check your state's specific regulations, as some states have restrictions on total candlepower or the number of forward-facing lights. All lights should be DOT-approved for highway use.

Do filler panels affect airflow or fuel economy?

Quality filler panels are designed to improve aerodynamics by smoothing airflow around the frame rails and reducing turbulence. When properly installed, they can marginally improve fuel economy (typically 1-2%) by reducing drag. However, poorly fitted or loose panels can create wind noise and actually increase drag. Ensure panels are securely mounted with all provided hardware and check that they don't interfere with brake lines, air lines, or other frame-mounted components. Panels should have drainage holes to prevent water accumulation.